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Added new state to SESSION: SESSION_STATE_STOPPING, which is set in protocol module before calling closeSession (router). THe new state tells that session is closing and DCBs included may not be polling anymore.

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Fixed some crash scenarios.
This commit is contained in:
VilhoRaatikka
2014-05-08 23:17:35 +03:00
parent a1361d9c9e
commit 8be4aba223
8 changed files with 216 additions and 113 deletions
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12
server/core/dcb.c
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@ -688,11 +688,20 @@ dcb_write(DCB *dcb, GWBUF *queue)
ss_dassert(queue != NULL);
/**
* SESSION_STATE_STOPPING means that one of the backends is closing
* the router session. Some backends may have not completed
* authentication yet and thus they have no information about router
* being closed. Session state is changed to SESSION_STATE_STOPPING
* before router's closeSession is called and that tells that DCB may
* still be writable.
*/
if (queue == NULL ||
(dcb->state != DCB_STATE_ALLOC &&
dcb->state != DCB_STATE_POLLING &&
dcb->state != DCB_STATE_LISTENING &&
dcb->state != DCB_STATE_NOPOLLING))
dcb->state != DCB_STATE_NOPOLLING &&
dcb->session->state != SESSION_STATE_STOPPING))
{
LOGIF(LD, (skygw_log_write(
LOGFILE_DEBUG,
@ -703,6 +712,7 @@ dcb_write(DCB *dcb, GWBUF *queue)
dcb,
STRDCBSTATE(dcb->state),
dcb->fd)));
ss_dassert(false);
return 0;
}